Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5689dd43f956f9…

MALICIOUS

PDF

37.9 KB Created: 2020-06-18 02:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04de63dc531b73efa31895607c233ec7 SHA-1: 3d8e4b4bb57a698a87f97ef4a65a9d7a9f4d89b5 SHA-256: be5689dd43f956f9e26d10cbc56befd4d932c15166655998690ce687ec3ce27b
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs that are also present in the heuristic findings, suggesting a coordinated effort to drive traffic to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://enkidimata.com/uploads/1/3/1/6/131636974/131636974.html#math+nets+worksheets
    • http://mta-sts.mailscanner.columbiacomputers.com/uploads/1/3/1/4/131436978/2006851.pdf
    • http://comfycribs.com/uploads/1/3/0/5/130539129/6906776.pdf
    • http://dmdesignwsussex.com/uploads/1/3/1/3/131380184/medupisamiwupikasig.pdf
    • http://fasoemarket.com/uploads/1/3/0/8/130873825/7013010.pdf
    • http://georgeanddukespetsitter.com/uploads/1/3/0/7/130776100/8abc0966.pdf
    • http://sktutorials.org/uploads/1/3/2/6/132681281/wadasemozubenobidajo.pdf
    • http://francesljohnsondesigns.com/uploads/1/3/0/5/130550895/418279.pdf
    • http://mail.stuijvesant.be/uploads/1/3/0/6/130639311/5338385.pdf
    • http://escwire.com/uploads/1/3/0/4/130476114/1dd9d8.pdf
    • http://475.undesirable.us/uploads/1/3/1/6/131636758/balazodip-zirepu-kavibek-xesak.pdf
    • http://dc-41c6f259fec2.khsfinefurniture.com/uploads/1/3/0/6/130620406/pikerizewuku.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c42.bin
a7e50f0ed8bdb6de1469fbd67c69eb03dfb87d92b08dbc96754a4521993626ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C42 4640 bytes
font_01_sfnt_off00006bff.bin
4bf0e1223eb97eb71e06fbb6c89ace06d007d1ef005cec6a2e20507eabffea02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFF 9256 bytes

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